“有机硅”在自然界中并不存在,但现代化学很难想象没有硅与碳结合的情况。虽然含硅商品化学品(例如通过“直接工艺” 1,2,3,4产生的那些)看起来很简单,但选择性制备芳基取代和烷基取代(官能化)硅化合物(称为硅烷)并非易事。氯硅烷如 Me 4− n SiCl n ( n = 1–3) 以及 SiCl 4 ( n = 4) 是合成含硅分子的常见起点。然而这些方法常常遇到具有挑战性的分离问题5 。相反,具有四个烷基的硅烷被认为是合成的死角。在这里,我们介绍了芳烃离子催化的卤代脱烷基化反应,可有效地将 Me 4 Si 和相关的季硅烷转化为各种官能化衍生物。该反应使用烷基卤和芳烃(共)溶剂:烷基卤是卤化物源,最终与芳烃进行弗里德尔-克来福特烷基化以再生催化剂6 ,而芳烃离子则充当强布朗斯台德酸原脱烷基化步骤7 。例如,在硅药物前体的合成中,证明了自上而下的卤代烷基化方法相对于报道的自下而上程序的优势。此外,连接到烷基链上的相当惰性的Me
DOI:
10.1038/s41586-023-06646-9
作为产物:
描述:
叔丁基三氯硅烷 在
CH3MgBr 作用下,
以
not given 为溶剂,
以61%的产率得到叔丁基(三甲基)硅烷
본 발명은 하기 화학식 I의 치환된 벤족사졸 (여기서 R은 하기 화학식 II, III, IV, V의 기를 나타냄), 및 그의 제조 방법, 및 질환, 특히 심혈관 질환, 바람직하게는 혈전성 또는 혈전색전성 질환의 치료 및/또는 예방을 위한 의약의 제조를 위한 그의 용도에 관한 것이다.
Three-Pronged Probes: High-Affinity DNA Binding with Cap, β-Alanines and Oligopyrrolamides
作者:Rüdiger Haug、Markus Kramer、Clemens Richert
DOI:10.1002/chem.201302972
日期:2013.11.18
TPP oligonucleotides: Hybridization probes that interrogate target sequences through base pairing, stacking on the terminus, and binding in the minor groove are presented (see figure). All subunits of the probes contribute to the target affinity, leading to melting point increases of up to 45 °C. (TPP=three‐pronged probe)
A method to derivatize surface silanol groups to Si-alkyl groups in carbon-doped silicon oxides
作者:Srikar Rao Darmakkolla、Hoang Tran、Atul Gupta、Shankar B. Rananavare
DOI:10.1039/c6ra20355h
日期:——
A carbon-doped silicon oxide (CDO) finds use as a material with a low dielectric constant (k) for copper interconnects in multilayered integrated circuits (ICs).
一种碳掺杂的氧化硅(CDO)被用作多层集成电路(ICs)中铜互连的低介电常数(k)材料。
The gas-phase acidities of the alkanes
作者:Charles H. DePuy、Scott Gronert、Stephan E. Barlow、Veronica M. Bierbaum、Robert Damrauer
DOI:10.1021/ja00188a003
日期:1989.3
acidities of 15 simple alkanes have been determined in a flowing afterglow-selected ion flow tube (FA-SIFT) by a kinetic method in which alkyltrimethylsilanes were allowed to react with hydroxide ions to produce a mixture of trimethylsiloxide ions by loss of alkane and alkyldimethylsiloxide ions by loss of methane. The reaction is proposed to proceed by addition of hydroxide ion to the silane to form
Cleavage of Unactivated Si−C(sp<sup>3</sup>) Bonds with Reed's Carborane Acids: Formation of Known and Unknown Silylium Ions
作者:Qian Wu、Zheng-Wang Qu、Lukas Omann、Elisabeth Irran、Hendrik F. T. Klare、Martin Oestreich
DOI:10.1002/anie.201805637
日期:2018.7.16
An efficient method for the benzenium‐ion‐mediated cleavage of inert Si−C(sp3) bonds is reported. Various tetraalkylsilanes can thus be converted into the corresponding counteranion‐stabilized silylium ions. The reaction is chemoselective in the case of hexamethyldisilane. Computations reveal a mechanism with backside attack of the proton at one of the alkyl groups. Several activated Si−C(spn) bonds